My sister is getting married in June. The rehearsal dinner is at a sort of fancy hotel, but I believe they're serving something simple like sub sandwiches. My other sister and I are bridesmaids and we have no idea how to dress for the dinner- fancy because its a fancy hotel? or informal because it's just a sandwich affair? We really don't want to go the wrong way, because our sister is the ultimate bridezilla and wearing the wrong thing would "ruin the whole wedding"